Hybrid Distances

I have Taylormade hybrids 3,4,5,6. Sometimes when I am hitting them they all seem to land within 5 yards of each other. What is that about? I hit my 4h today to about 205, then hit the 5h which landed 10' from the 4h, then took out my 6h and it landed about 5 yards short of those two. Is this an angle of attack thing that keeps them so close?